427 lines
10 KiB
Go
427 lines
10 KiB
Go
package nomad
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import (
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"fmt"
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"os"
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"path"
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"strings"
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"sync/atomic"
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"testing"
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"time"
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"github.com/hashicorp/nomad/ci"
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"github.com/hashicorp/nomad/testutil"
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"github.com/hashicorp/raft"
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"github.com/hashicorp/serf/serf"
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"github.com/hashicorp/serf/testutil/retry"
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"github.com/stretchr/testify/require"
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)
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func TestNomad_JoinPeer(t *testing.T) {
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ci.Parallel(t)
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s1, cleanupS1 := TestServer(t, nil)
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defer cleanupS1()
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s2, cleanupS2 := TestServer(t, func(c *Config) {
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c.Region = "region2"
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})
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defer cleanupS2()
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TestJoin(t, s1, s2)
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testutil.WaitForResult(func() (bool, error) {
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if members := s1.Members(); len(members) != 2 {
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return false, fmt.Errorf("bad: %#v", members)
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}
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if members := s2.Members(); len(members) != 2 {
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return false, fmt.Errorf("bad: %#v", members)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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testutil.WaitForResult(func() (bool, error) {
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if len(s1.peers) != 2 {
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return false, fmt.Errorf("bad: %#v", s1.peers)
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}
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if len(s2.peers) != 2 {
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return false, fmt.Errorf("bad: %#v", s2.peers)
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}
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if len(s1.localPeers) != 1 {
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return false, fmt.Errorf("bad: %#v", s1.localPeers)
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}
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if len(s2.localPeers) != 1 {
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return false, fmt.Errorf("bad: %#v", s2.localPeers)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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}
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func TestNomad_RemovePeer(t *testing.T) {
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ci.Parallel(t)
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s1, cleanupS1 := TestServer(t, nil)
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defer cleanupS1()
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s2, cleanupS2 := TestServer(t, func(c *Config) {
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c.Region = "global"
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})
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defer cleanupS2()
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TestJoin(t, s1, s2)
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testutil.WaitForResult(func() (bool, error) {
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if members := s1.Members(); len(members) != 2 {
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return false, fmt.Errorf("bad: %#v", members)
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}
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if members := s2.Members(); len(members) != 2 {
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return false, fmt.Errorf("bad: %#v", members)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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// Leave immediately
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s2.Leave()
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s2.Shutdown()
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testutil.WaitForResult(func() (bool, error) {
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if len(s1.peers) != 1 {
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return false, fmt.Errorf("bad: %#v", s1.peers)
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}
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if len(s2.peers) != 1 {
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return false, fmt.Errorf("bad: %#v", s2.peers)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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}
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func TestNomad_ReapPeer(t *testing.T) {
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ci.Parallel(t)
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dir := tmpDir(t)
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defer os.RemoveAll(dir)
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s1, cleanupS1 := TestServer(t, func(c *Config) {
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c.NodeName = "node1"
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node1")
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})
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defer cleanupS1()
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s2, cleanupS2 := TestServer(t, func(c *Config) {
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c.NodeName = "node2"
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node2")
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})
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defer cleanupS2()
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s3, cleanupS3 := TestServer(t, func(c *Config) {
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c.NodeName = "node3"
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node3")
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})
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defer cleanupS3()
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TestJoin(t, s1, s2, s3)
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testutil.WaitForResult(func() (bool, error) {
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// Retry the join to decrease flakiness
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TestJoin(t, s1, s2, s3)
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if members := s1.Members(); len(members) != 3 {
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return false, fmt.Errorf("bad s1: %#v", members)
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}
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if members := s2.Members(); len(members) != 3 {
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return false, fmt.Errorf("bad s2: %#v", members)
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}
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if members := s3.Members(); len(members) != 3 {
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return false, fmt.Errorf("bad s3: %#v", members)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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testutil.WaitForLeader(t, s1.RPC)
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// Simulate a reap
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mems := s1.Members()
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var s2mem serf.Member
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for _, m := range mems {
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if strings.Contains(m.Name, s2.config.NodeName) {
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s2mem = m
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s2mem.Status = StatusReap
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break
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}
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}
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// Shutdown and then send the reap
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s2.Shutdown()
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s1.reconcileCh <- s2mem
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s2.reconcileCh <- s2mem
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s3.reconcileCh <- s2mem
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testutil.WaitForResult(func() (bool, error) {
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if len(s1.peers["global"]) != 2 {
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return false, fmt.Errorf("bad: %#v", s1.peers["global"])
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}
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peers, err := s1.numPeers()
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if err != nil {
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return false, fmt.Errorf("numPeers() failed: %v", err)
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}
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if peers != 2 {
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return false, fmt.Errorf("bad: %#v", peers)
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}
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if len(s3.peers["global"]) != 2 {
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return false, fmt.Errorf("bad: %#v", s1.peers["global"])
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}
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peers, err = s3.numPeers()
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if err != nil {
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return false, fmt.Errorf("numPeers() failed: %v", err)
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}
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if peers != 2 {
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return false, fmt.Errorf("bad: %#v", peers)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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}
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func TestNomad_BootstrapExpect(t *testing.T) {
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ci.Parallel(t)
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dir := tmpDir(t)
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defer os.RemoveAll(dir)
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s1, cleanupS1 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node1")
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})
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defer cleanupS1()
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s2, cleanupS2 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node2")
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})
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defer cleanupS2()
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s3, cleanupS3 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node3")
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})
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defer cleanupS3()
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TestJoin(t, s1, s2, s3)
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// Join a fourth server after quorum has already been formed and ensure
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// there is no election
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s4, cleanupS4 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 3
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c.DevMode = false
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c.RaftConfig = raft.DefaultConfig()
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c.DataDir = path.Join(dir, "node4")
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})
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defer cleanupS4()
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// Make sure a leader is elected, grab the current term and then add in
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// the fourth server.
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t.Logf("waiting for stable leadership and up to date leadership")
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leader := waitForStableLeadership(t, []*Server{s1, s2, s3})
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require.NoError(t, leader.raft.Barrier(10*time.Second).Error())
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termBefore := leader.raft.Stats()["last_log_term"]
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t.Logf("got term: %v\n%#+v", termBefore, leader.raft.Stats())
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var addresses []string
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for _, s := range []*Server{s1, s2, s3} {
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addr := fmt.Sprintf("127.0.0.1:%d", s.config.SerfConfig.MemberlistConfig.BindPort)
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addresses = append(addresses, addr)
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}
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// Wait for the new server to see itself added to the cluster.
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testutil.WaitForResult(func() (bool, error) {
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// Retry join to reduce flakiness
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if _, err := s4.Join(addresses); err != nil {
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return false, fmt.Errorf("failed to to join addresses: %v", err)
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}
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p4, _ := s4.numPeers()
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if p4 != 4 {
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return false, fmt.Errorf("expected %d peers found %d", 4, p4)
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}
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return true, nil
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}, func(err error) {
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require.NoError(t, err)
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})
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// Make sure there's still a leader and that the term didn't change,
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// so we know an election didn't occur.
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leader = waitForStableLeadership(t, []*Server{s1, s2, s3, s4})
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require.NoError(t, leader.raft.Barrier(10*time.Second).Error())
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termAfter := leader.raft.Stats()["last_log_term"]
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require.Equal(t, termBefore, termAfter, "expected no election")
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}
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func TestNomad_BootstrapExpect_NonVoter(t *testing.T) {
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ci.Parallel(t)
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dir := t.TempDir()
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// Create first server, non-voter
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s1, cleanupS1 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 2
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c.DevMode = false
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c.DataDir = path.Join(dir, "node1")
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c.NumSchedulers = 0
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c.NonVoter = true
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})
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defer cleanupS1()
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// Create second server, non-voter
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s2, cleanupS2 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 2
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c.DevMode = false
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c.DataDir = path.Join(dir, "node2")
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c.NumSchedulers = 0
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c.NonVoter = true
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})
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defer cleanupS2()
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// Create third server, non-voter
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s3, cleanupS3 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 2
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c.DevMode = false
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c.DataDir = path.Join(dir, "node3")
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c.NumSchedulers = 0
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c.NonVoter = false
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})
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defer cleanupS3()
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// Join the three servers we have so far
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TestJoin(t, s1, s2, s3)
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// Assert that we do not bootstrap, because BE=2, but only 1 voter
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testutil.AssertUntil(testutil.Timeout(time.Second), func() (bool, error) {
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_, p := s1.getLeader()
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if p != nil {
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return false, fmt.Errorf("leader %v", p)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("should not have leader: %v", err)
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})
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// Create fourth server that is a voter
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s4, cleanupS4 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 2
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c.DevMode = false
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c.DataDir = path.Join(dir, "node4")
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c.NumSchedulers = 0
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c.NonVoter = false
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})
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defer cleanupS4()
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// Join with fourth server (now have quorum)
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// Start with 4th server for higher chance of success
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TestJoin(t, s4, s3, s2, s1)
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// Assert leadership with 4 peers
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servers := []*Server{s1, s2, s3, s4}
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for _, s := range servers {
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testutil.WaitForLeader(t, s.RPC)
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retry.Run(t, func(r *retry.R) { r.Check(wantPeers(s, 4)) })
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}
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}
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func TestNomad_BadExpect(t *testing.T) {
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ci.Parallel(t)
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s1, cleanupS1 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 2
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})
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defer cleanupS1()
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s2, cleanupS2 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 3
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})
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defer cleanupS2()
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servers := []*Server{s1, s2}
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TestJoin(t, s1, s2)
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// Serf members should update
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testutil.WaitForResult(func() (bool, error) {
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for _, s := range servers {
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members := s.Members()
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if len(members) != 2 {
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return false, fmt.Errorf("%d", len(members))
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}
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("should have 2 peers: %v", err)
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})
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// should still have no peers (because s2 is in expect=2 mode)
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testutil.WaitForResult(func() (bool, error) {
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for _, s := range servers {
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p, _ := s.numPeers()
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if p != 0 {
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return false, fmt.Errorf("%d", p)
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}
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("should have 0 peers: %v", err)
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})
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}
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// TestNomad_NonBootstraping_ShouldntBootstap asserts that if BootstrapExpect is zero,
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// the server shouldn't bootstrap
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func TestNomad_NonBootstraping_ShouldntBootstap(t *testing.T) {
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ci.Parallel(t)
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dir := tmpDir(t)
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defer os.RemoveAll(dir)
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s1, cleanupS1 := TestServer(t, func(c *Config) {
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c.BootstrapExpect = 0
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c.DevMode = false
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c.DataDir = path.Join(dir, "node")
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})
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defer cleanupS1()
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testutil.WaitForResult(func() (bool, error) {
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s1.peerLock.Lock()
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p := len(s1.localPeers)
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s1.peerLock.Unlock()
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if p != 1 {
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return false, fmt.Errorf("%d", p)
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("expected 1 local peer: %v", err)
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})
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// as non-bootstrap mode is the initial state, we must wait long enough to assert that
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// we don't bootstrap even if enough time has elapsed. Also, explicitly attempt bootstrap.
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s1.maybeBootstrap()
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time.Sleep(100 * time.Millisecond)
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bootstrapped := atomic.LoadInt32(&s1.config.Bootstrapped)
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require.Zero(t, bootstrapped, "expecting non-bootstrapped servers")
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p, _ := s1.numPeers()
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require.Zero(t, p, "number of peers in Raft")
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}
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